Authentication Every Request in WCF Rest Service coming from JQUERY client

I developed a SOA WCF Rest service and deployed on a server ..
Different application will be use my Rest service using JQuery. I want to authenticate the request coming from different clients..

So how i authenticate the request?  Or ask to the client to send the Authentication details with required data for operation and how he/she can send details with data to authenticate the request using JQuery and how i handle that data in my service?

Thanks in advance....